VA Tom, I'm a little slow picking up on that you're from another country. That explains why I've never seen our HPWH and your black cap.
I've only seen the silver capacitor. If your wires and connector are black because of heat stress, replace the ends on the wires.
I grew up in a family that repaired A/C's. 50 years ago some A/C came wired from the factory with a second start cap wired in with a relay, so the start cap was only used for a second or two to help get compressor going. It was wired in parallel to the run cap just like my friends 5 hp air compressor motor came with a start and run cap.
Well about 40 years ago someone invented a simpler way to add a start capacitor to an air conditioner compressor. All you do is put the hard start kit in parallel with the run cap. Like I said they come in about 3 or 4 diffrent sizes, meaning the capacitor inside the HS kit might start out around 200 MFD and the larger one were around 500 MFD.
If you have a used start capacitor from another motor just wire it in parallel with the run capacitor, apply power for a second or two and see if compressor starts. If it does, you may want to order a HS kit. If it doesn't try a larger start cap.
Did you measure the internal resistance of compressor? There should be a small resistance between the common and run terminal on compressor, between the common and start and between start and run. There should be infinate resistance between all the terminals and the metal frame of compressor.
Let me know what is happening. Does the compressor hum when you apply power? Just won't start up? Good luck. George
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